/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.camunda.bpm.engine.impl.bpmn.helper;

import java.util.List;

import org.camunda.bpm.engine.impl.bpmn.parser.EscalationEventDefinition;
import org.camunda.bpm.engine.impl.pvm.PvmActivity;
import org.camunda.bpm.engine.impl.pvm.PvmScope;
import org.camunda.bpm.engine.impl.tree.TreeVisitor;

public class EscalationEventDefinitionFinder implements TreeVisitor<PvmScope> {

  protected EscalationEventDefinition escalationEventDefinition;

  protected final String escalationCode;
  protected final PvmActivity throwEscalationActivity;

  public EscalationEventDefinitionFinder(String escalationCode, PvmActivity throwEscalationActivity) {
    this.escalationCode = escalationCode;
    this.throwEscalationActivity = throwEscalationActivity;
  }

  @Override
  public void visit(PvmScope scope) {
    List<EscalationEventDefinition> escalationEventDefinitions = scope.getProperties().get(BpmnProperties.ESCALATION_EVENT_DEFINITIONS);
    this.escalationEventDefinition = findMatchingEscalationEventDefinition(escalationEventDefinitions);
  }

  protected EscalationEventDefinition findMatchingEscalationEventDefinition(List<EscalationEventDefinition> escalationEventDefinitions) {
    for (EscalationEventDefinition escalationEventDefinition : escalationEventDefinitions) {
      if (isMatchingEscalationCode(escalationEventDefinition) && !isReThrowingEscalationEventSubprocess(escalationEventDefinition)) {
        return escalationEventDefinition;
      }
    }
    return null;
  }

  protected boolean isMatchingEscalationCode(EscalationEventDefinition escalationEventDefinition) {
    String escalationCode = escalationEventDefinition.getEscalationCode();
    return escalationCode == null || escalationCode.equals(this.escalationCode);
  }

  protected boolean isReThrowingEscalationEventSubprocess(EscalationEventDefinition escalationEventDefinition) {
    PvmActivity escalationHandler = escalationEventDefinition.getEscalationHandler();
    return escalationHandler.isSubProcessScope() && escalationHandler.equals(throwEscalationActivity.getFlowScope());
  }

  public EscalationEventDefinition getEscalationEventDefinition() {
    return escalationEventDefinition;
  }

}
